Point of terminology: "TTL serial" is a severely over-broad term, " (point-to-point) asynchronous serial (at TTL levels)" seems to be what you're asking about. (Though that's still probably lacking, but at least …

Jun 22, 2023 · TTL requires that logic 1 input must be at least 2V, and TTL drivers are designed to guarantee that. That is far short of what this driver requires to register as logic 1.

1. TTL电平 TTL指双极型三极管逻辑电路（transistor transistor logic），这种信号0对应0V，1对应3.3V或5V，与单片机、MCU、SOC的IO电平兼容。 不过实际也不一定是TTL电平，因为现在大部分数字逻 …

TTL指的是由晶极管构成的 数字芯片。这类芯片功耗高，通常的TTL电平是5V。 CMOS是指由 MOS管 构成是数字芯片。这类芯片功耗低。 电平 太多了有5V，3.3V，1.8V，1.2V。 你问的高低电平的阈值 …

Aug 14, 2012 · TTL mean Transistor-Transistor-Logic and has its level for logical zero near 0V and for logical one near 5V. Often any 5V logic is called TTL, although most circuits nowadays are built as …

Mar 8, 2024 · 此外，增量编码器的信号输出电平标准也是多样的，常见的有TTL、HTL、PNP和NPN等。 TTL和HTL是常见的电平标准，其中TTL为长线差分驱动，而HTL也称为推拉式或推挽式输出，适用 …

Mar 21, 2018 · What is the difference of these two ttl nand gates? What is a totem pole, what does it do and what is it used for? When connecting multiple ttl logic gates together is it better to use one or the...

既然IP数据包有TTL跳数限制，那它是如何实现远距离（横跨大半个地球）通信的？ 首先对问题进行补充解释一下:IP数据包有TTL跳数限制，跳数变为零时数据包就被丢弃。 那么问题来了，当需要远距离 …

TTL是 递归DNS 缓存域名解析的时间，以秒为单位。 过期了递归DNS就会去找 权威DNS 重新查询。 （ 什么是TTL值？ ） 如果你的域名解析改动较频繁，比如使用 动态IP 等，就应该把TTL尽量设小； 如 …

Mar 10, 2018 · I've been having some issues lately with the usage of 10k ohm resistors as pull down resistors for 74ls series chips. Most people seem to choose 10k resistors as their default pull …